We have shown that it is possible to reversibly intercalate two lithium or sodium ions into phosphate host lattices without any degradation of the host lattice. Such reactions are highly dependent on the host lattice. We have shown that two lithium ions can intercalate into the e- and b-VOPO4phases. In these lattices, the first lithium ion intercalates by a slow two-phase reaction VOPO4+LiVOPO4, whereas the second ion intercalates by a fast single-phase reaction, Li1+xVOPO4. However, for the larger sodium ion, the expanded lattice formed by the de-intercalation of K from KVOPO4is required for the intercalation of two sodium ions. The synthesis and characterization of these materials will be described, together with future opportunities.

Multialkali ion intercalation reactions make feasible higher energy density cathodes

2019 Fall National Meeting

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